neonatal glycine encephalopathy (MONDO_0017353) is a frequent, usually severe form of glycine encephalopathy (GE) characterized by coma, apnea, hypotonia, seizure and myoclonic jerks in the neonatal period, and subsequent developmental delay. Also known as: classic glycine encephalopathy, neonatal NKH, neonatal non-ketotic hyperglycinemia.